PARAMETER_PATH_INFO

As portlets do not have a pathInfo in the request, we can simulate this by passing
a parameter. If parameter is null, this will translate to the absent pathInfo,
and portlets will be matched in the sitemap using only servletPath.

getOutputStream

Get the output stream where to write the generated resource.
The returned stream is buffered by the environment. If the
buffer size is -1 then the complete output is buffered.
If the buffer size is 0, no buffering takes place.
This method replaces AbstractEnvironment.getOutputStream().